FCE Use of English Part 2, Sloths

Answers and explanations

9. Number. The idea of the word here should be obvious. Please be careful not to answer ‘amount’, as it is more suitable for uncountable nouns.
10. From. To benefit from something is to enjoy advantages of it.The word ‘hasteless’ might be a bit confusing – it means without any haste or hurry.
11. Way. ‘Life’ seems like a possible answer, but the context would have to be “… live the life they HAVE”.
12. Seen/spotted. Both options have the idea of identifying something visually, with your eyes. Be careful not to use ‘found’, as the meaning would change slightly, because it covers a bigger array of ways of identifying something, like hearing or smelling. Here the idea is of camouflaging, so the visual element is the focus.
13. To. Other options you might have considered is ‘in’ and ‘by’. The first one means that the habitat is small there – this is incorrect if we take more context into account. ‘Limited by’ implies that the area itself has limited the habitat that the animals have, which makes no sense.
14. Due/thanks. Even though ‘due’ and ‘thanks’ have slightly different usages, both can be put in here, but the meaning of the sentence changes. This is because ‘due to’ is more common in negative situations, while ‘thanks to’, as its name suggests, is reserved for positive ones.
15. Mistaken/taken. Yet another case where you have more freedom in choosing the word. The choice is dictated by ‘to’ that immediately follows the gap.
16. One. ‘To pick up’ here means to recognize, to detect. A case when ‘one’ is used to avoid repetition of the word ‘expression’ that is clearly implied by the context.